# Signal Analysis and transmission

**Q6. Signum function sgn(f), for f>0, f=0 and f<0, has the values:**

**Options: **

a) a) -1 to +1

b) b) +1, 0, -1 respectively

c) c) -∞ to + ∞

d) d) 0 always

Correct Answer: b) +1, 0, -1 respectively

**Explanation :**

The sgn(f) is a signum function that is defined in the frequency domain as

sgn(f) = 1, f> 0

= 0, f= 0

= -1, f< 0

Mathematically, the sign function or signum function is an odd mathematical function which extracts the sign of a real number and is often represented as sgn.